Rotary pulverizer



E CORTESE, M. CRESPI AND A. SQUASSI.

ROTARY PULVERIZER. APPLICATION FILED JAN- 29; 1920.

Patented May 11, 1920-.

UNITED sTATEs PATENT OFFICE.

EMILIO CORTESE, MARIO GRESPI, AND ALESSANDRO SQUASSI, OF MILAN, ITALY.

ROTARY PUL'VERIZER.

Specification of Letters Patent.

Patented May 11, 1920.

To all whom it may concern:

Be it known that we, EMILIO CoRTEsE, Mauro GRnsPI, and ALnssANDRo S UAssI, subjects of the King of Italy, residing at Milan, Italy, have invented certain new and useful Improvements in Rotary Pulverlzers, of which the following is a specification.

The pulverizer forming the subject of thls invention is an apparatus intended to reduce to an impalpable powder minerals which do not possess too high a degree of hardness. The accompanying drawing shows by way of example one construction embodying thls invention, Figure 1 being a transverse sectional elevation and Fig. 2 a vertical section through the machine.

The machine comprises a casting open on two sides, and having semi-cylindrical lower portion A, and an upper portion 13 in the form of a parallelepiped. One of the two sides is closed by a filling hopper C which allows the material to be pulverized to fall into the machine a little below the axis of the disintegrator. The other side is formed by a cover D which serves also as a bearing for the rotating shaft E. Upon the rotating shaft are arranged two series of radial arms connected by a circular band of metal and formin as it were two very narrow beater wheels T, F. Upon the outside of these two wheels and parallel to the rotating shaft are fixed, by means of half rings, small beater bars G of steel and of square section; four of which are shown in the drawing, but their number may be increased. Between the two series of radial arms or wheels is fixed an air agitator or blower J, which, rotating with the pulleys, operates as a fan or ventilator. The specific form of blower shown comprises perforated side plates.

In the upper corners of the casing there are fixed two blocks of hardened steel or iron H, H formed with saw teeth. The removal or replacement of these two blocks is facilitated by means of bolts K, K and set screws I. In the lower cylindrical portion of the casing and in one side thereof is arranged a grid L over an opening therein and across which the pulverized material passes. This grid is fixed to the casing outside and is formed of a'number of bars very close together, so as only to allow material to pass when it has been very finely pulverized, each bar extending parallel to the arc of rotation of the beater bars G.

The operation of the pulverizer is as follows The material is poured into the hopper, falling toward the shaft of the pulverizer, and is thrown against the saw teeth of the blocks H, H and is disintegrated between these and the rotating steel bars G, and finally driven out through the grid by the current of air.

The rigidity of the disintegrator is to be particularly noticed; and the employment of the fan allows the impalpable powder obtained to be thrown to a distance through the grid while the material which has not reached the same degree of fineness drops below the grid where it is collected in a suitable receptacle, if desired and which is not shown in the drawing, to be passed again through the pulverizer.

We claim as our invention:

1. In a pulverizing apparatus, the combination of a casing forming a pulverizing chamber; stationary pulverizing means located in said chamber; a shaft; beater wheels mounted thereon; beater bars mounted on said beater wheels and cooperating with said stationary pulverizing means; a grid provided over an opening in said casing and through which both impalpable powder and granular material may pass; and a blower located in said pulverizing chamber between the shaft and the beater bars and having its blast directed toward said grid, for blowing the impalpable powder from the pulverizing chamber through the grid while permitting granular material to fall through said grid.

2. In a pulverizing apparatus, the combination of a casing forming a pulverizing chamber; a stationary pulverizing means located in said chamber; a shaft; beater wheels mounted on said shaft; beater bars mounted on said beater wheels and cooperating with said stationary pulverizing means; a grid provided over an opening in said casing and through which both impalpable powder and granular material may pass; and a blower located in said pulverizing chamber between the shaft and the beater bars and mounted on said shaft independently of said beater wheels, said blower having its blast directed toward said grid for blowing the impalpable powder from the pulverizing chamber through the grid while permitting granular material to fall through said grid.

8. In a pulverizing apparatus, the combination of a casing forming a pulverizing chamber, said casing-comprising a semi-circular portion and a rectangular portion; beaters mounted in said casing in an are concentric with thesemi'circular portion of the g heaters; and adjusting means for moving the prismatic members bodily to and from said corners and to and from the heaters.

In testimony whereof we aflix our signatures.

EMILIO CORTESE. MARIO ORESPI. ALESSANDRO SQUASSI. 

